Effect of Upstream Pressure on the Flux of Single Permeant in Pervaporation

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Abstract

The effect of the upstream pressure on the pervaporation flux of water was studied both theoretically and experimentally. The increase in the pervaporation flux with an increase in the upstream pressure was predicted using newly developed transport equations that allow the pressure change across the membrane and include both liquid and vapor phase transport. The conventional solution-diffusion model, on the other hand, fails to predict the effect of the upstream pressure, particularly when an assumption is made that the pressure of the permeant inside the membrane is constant across the membrane and is equal to the upstream pressure. The pervaporation flux of water through a polydimethysiloxane membrane and an aromatic polyamide membrane was found, experimentally, to increase with an increase in the upstream pressure.

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Keywords

  • Pervaporation
  • Membrane
  • Aromatic Polyamide
  • Polydimethylsiloxane
  • Membrane Transport

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